Improvement in ventilators



(LR. MQORE. l

Ventilator.`

No.215,279. PatentedMay13,1s7-9.

UNITED STATES PATENT uOFFICE,

GEORGE R. MOORE, OE PHILADELPHIA, PENNSYLVANIA.

IM PROVEMENT IN VENTI LATO RS.

Specification forming part of Letters Patent No. 215,279, dated May 13, 1879; application :filed March 8, 1879.

` work in the out-side atmosphere, exposed to varying forces and currents of wind and vary ing atmospheric pressure.

The object of my improvement is to provide a structure that shall, at'all times, present on its face side to the wind in velocityless facility for the admission of compressed air over the immediate central open pipe or flue, or for air to become compressed just at that point, than has heretofore been the case in the kind of ventilators of which my invention is an improvement. 4

A cylindrical Hue with a conical flange at the top and surmounting upon small standards, at a distance above nearly equal to the diameter of the ue, a lat plate or other top nish, is Vau old and extensively-used chimneycap or ventilator; but there are many situations where it does not prevent a back draft 5 and in some such cases I have found a deiiecting-band, which I have placed around between the conical flange and top finish, has been entirely successful in both preventing the back draft and in increasing the up draft.

The deiiecting-band seems so to obstruct the force of wind through the ventilator asto give the inside air a better opportunity to escape; but Ineed not give any theory. It operates well in places where others have failed.

Figure .1 is a perspective view; Fig. 2, a vertical transverse section.

A is the pipe; B, the conical ange C, the deecting-band; D, the top iinish 5 E, supports to the top and band.

I claimn In combination with the flue A, provided with the inclined delecting-band B and surmounted with the top plate D, the intervening band G, made of such width as to allow the outside air a free passage through the ventilator above and below the same, substantially as and for the purpose herein set forth.

GEO. R. MOORE. 

